JPH0245329A - Device control device for folding mechanism for packaging machine film - Google Patents

Abstract

PURPOSE:To reduce an impact which is added instantaneously to a cam mechanism and right and left folding plates attaching parts at the time of retracting completion of a rear folding plate, prevent the damage and reduce the noise by performing a control to shift the torque of a motor from large to small for a predetermined period prior to the stoppage when the driving motor gives a reverse revolution. CONSTITUTION:A timing signal generating part for a control part is equipped with a timing disk on which slits are provided at every predetermined angle. It is constituted so that one cycle is completed by one revolution, detects a rotational angle and performs the control of respective parts. A driving motor, as shown by a curve (c), revolves forward from 60 deg. to 140 deg., makes a rear folding plate 105 advance and folds the rear end of a film, which covers an object to be packaged, under a tray bottom. At the same time, right and left folding plates 107, 108 approach each other and fold the right and left ends under the tray bottom. The rear folding plate 105 is made to retreat from 260 deg. to 340 deg., and the right and left folding plates 107, 108 separate. By giving a pulse state to the power which is supplied to the motor during a period C before the retreating completion of the rear folding plate 105, as shown by a curve (f), the torque of the motor can be adjusted by the duty ratio of this pulse state power.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive control device for a film folding mechanism of a stretch film packaging machine.

[Prior art]

Conventionally, as a film folding mechanism of this type of stretch film packaging machine, there is a film folding mechanism of a packaging apparatus previously filed by the present applicant. As will be detailed later, this film folding mechanism includes mounting plates that face each other and are movable left and right,
A structure comprising a left and right folding plate attached to this mounting plate, and a rear folding plate that is equipped with a cam roller that moves along a cam groove provided in this mounting plate and moves back and forth in a direction perpendicular to the moving direction of the mounting plate. It is.

Thereafter, by moving the folding plate back and forth using the driving force of the drive motor, the left and right mounting plates are moved toward or apart from each other via a cam mechanism constituted by the cam groove, cam roller, and the like. Further, as the left and right mounting plates approach or separate from each other, the left and right folding plates approach or separate from each other.

When packaging an item stored in a tray, the rear folding plate is moved forward by the power of the drive motor, and the rear end of the stretch film placed on the item to be packaged is folded into the bottom of the tray, and at the same time the left and right folding plates are folded. When approached, the left and right ends of the film are folded into the bottom of the tray, and the object to be packaged is wrapped with the stretch film along with the tray.

[Problem to be solved by the invention]

In the film folding mechanism of the packaging machine having the above configuration, there is a problem in that the cam mechanism instantaneously applies an impact to the left and right folding plate attachment parts when the rear folding plate is completely retracted, causing damage to the parts. In addition, there was a problem in that the instantaneous impact caused a large amount of noise.

As a countermeasure to this problem, if the structure of the cam mechanism and the mounting part is made strong and less likely to generate noise, there is a problem that the mechanism becomes complicated and causes an increase in cost.

The present invention has been made in view of the above-mentioned points, and eliminates the above-mentioned problems, eliminates the instantaneous large impact when the rear folding plate is completely retracted, produces less noise, and is inexpensive. An object of the present invention is to provide a drive control device for a film folding mechanism of a packaging machine.

[Means to solve the problem]

In order to solve the above problems, the present invention has configured a drive control device for a packaging machine film folding mechanism as follows.

It has left and right folding plates that are movable in directions facing each other and a rear folding plate that moves in a direction substantially perpendicular to the moving direction of the left and right folding plates, and the rear folding plate and the left and right folding plates are directly or indirectly connected to a cam. In a packaging machine film folding mechanism comprising a film folding mechanism that is configured to interlock with each other via a mechanism and a drive motor that drives the film folding mechanism, when the rear folding plate moves forward due to normal rotation of the drive motor. At the same time, the left and right folding plates approach each other, and as the drive motor reverses, the rear folding plate retreats, and at the same time the left and right folding plates separate from each other. A motor drive control means for controlling torque switching from large to small is provided.

Further, the motor drive control means is characterized in that it includes a torque control means that supplies pulsed power to the drive motor for a predetermined period before stopping, and changes the motor torque according to the pulsed duty ratio.

Further, the drive motor is an AC motor, and the pulse width of the pulsed electric power is at least larger than 1/2 period of the AC power supply.

Further, the torque control means of the motor drive control means is comprised of a solid state relay that is turned on and off by a signal from a computer.

[Effect]

As described above, the drive control device of the film folding mechanism of the packaging machine is provided with a motor drive control means that controls the torque of the drive motor to be switched from high to low for a predetermined period before stopping when the drive motor is reversed. When the folding plate completes its retraction, the instantaneous impact applied to the cam mechanism and the left and right folding plate attachment parts is weakened, and as a result, damage and noise can be reduced without requiring a special structure for the film folding mechanism of the packaging machine. becomes possible.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, the structure of a packaging machine film folding mechanism using the drive control device of the present invention will be explained. FIG. 2 is a plan view of the film folding mechanism of the packaging machine.

The film folding mechanism can be placed at a predetermined position on the packaging machine. In the figure, reference numerals 101 and 102 are mounting plates provided movably in opposite directions, and the mounting plates 101 and 10
2 have cam grooves 103 and 104 formed therein, respectively. Sliding members 113 and 114 are attached to the mounting plate 101, and each of the sliding members 113 and 114
It is configured to be movable along 17°118. Further, sliding members 115 and 116 are attached to the mounting plate 102, and the sliding members 11.5 and 116 are configured to be movable along rods 119 and 120, respectively.

The mounting plate 101 has a package discharge side (lower side in FIG. 1).
A left folding plate 107 is provided that rotates along the surface of the mounting plate 101 about a shaft 109 as a rotation center. Further, the mounting plate 102 is provided with a right folding plate 108 that rotates along the surface of the mounting plate 102 with the package discharge side shaft 110 as a rotation center.

A guide member 121 having a guide groove 123 is attached to the mounting plate 101, and a guide rod (not shown) is fixed to the left folding plate 107 along the guide groove 123.
moves to guide the left folding plate 107. Similarly, a guide member 124 having a guide groove 125 is attached to the mounting plate 102, and a guide rod (not shown) fixed to the right folding plate 108 moves along the guide groove 125. It is adapted to guide the right folding plate 108. A coil spring 111 is attached to the opposite end of the left folding plate 107 to the shaft 109, and urges the left folding plate 107 in a direction opposite to the right folding plate 108. Further, a coil spring 112 is attached to the opposite end of the right folding plate 108 from the shaft 110.
is urged in the opposite direction of the left folding plate 107.

Further, sliding members 126 and 127 are fixed to both ends of the rear folding plate 105. A shaft 129 is fixed to the rear end of the sliding member 127, and a cam roller 132 is attached to the shaft 129. Further, a shaft 128 is fixed to the rear end of the sliding member 126, and a cam roller 131 is attached to the shaft 128. When the rear folding plate 105 is advanced,
Cam rollers 131 and 132 move along cam grooves 103 and 104 to move mounting plates 101 and 102 in opposite directions.

Note that the rear folding plate 105 is moved forward and backward by a drive motor (not shown) that rotates forward and reverse, via a crank mechanism (not shown).

When packaging the items stored in the tray, the left folding plates 107 and 108 are moved by an elevator mechanism (not shown).
Push up the film stretched over the bottom of the box from below, and push up the packaged items that protrude above the left folding plates 107 and 108.
By moving the rear folding plate 105 forward (downward in FIG. 2), the rear end of the film covering the object to be packaged is folded into the bottom of the tray, and at the same time, the left and right edges of the film are folded by the left folding plates 107 and 108 approaching each other. fold into the bottom of the tray. Furthermore, by pushing out the packaged item using a discharge button (not shown), the front end of the film is folded into the bottom of the tray.

The detailed structure and operation of the film folding mechanism of the packaging machine are disclosed in detail in the specification of Japanese Utility Model Application No. 109774/1982, so they will be omitted here.

In the above packaging machine film folding mechanism, the rear folding plate 10
5, when the drive motor is reversed and the folding plate 105 is moved backward, cam rollers 131 and 1 are formed at the rear ends of the cam grooves 103 and 104 provided in the mounting plates 101 and 102.
32 suddenly collides with each other, instantaneous impact is applied to various parts such as the cam mechanism and the attachment parts of the left and right folding plates 107 and 108 to the mounting plates 101 and 102, which may damage these parts or generate loud noise. There was a problem. Therefore, in the present invention, a motor drive control means is provided which controls the torque of the chain drive motor to be switched from large to This is designed to reduce the instantaneous shock that is applied upon completion. This motor drive control means will be explained in detail below.

FIG. 1 is a block diagram showing a system configuration of a drive control section of a film folding mechanism of a packaging machine and control sections of various parts related thereto. In the same figure, reference numeral 10 indicates a control signal for each part of the packaging machine, such as the film folding mechanism and the elevator mechanism.
PU, 11 is R where various programs and data are stored.
OM, 12 is a timer that sets the duty ratio of pulsed power supplied to the drive motor of the film folding mechanism; 13
14 is a RAM, 14 is an interface circuit, 15 is a weighing label printer that sends and receives various data to and from the packaging machine, 1
Reference numeral 6 denotes a mechanism control unit that controls each mechanical part of the packaging machine, 17 a switch that commands opening of the film clamp, 18 a drive motor that drives the elevator mechanism of the packaging machine, and 19 synchronized with the rotation of the drive motor 18. 20 is a drive motor for the film folding mechanism. Note that the timer 12 is configured to turn the output ON and OFF every 20 msec.

FIG. 3 is a mechanical chart diagram for explaining the operation of the film folding mechanism. In the figure, (a) shows the timing signal from the timing signal generator 19, (b) shows the operation of the elevator, and (c) shows the left and right folding plates 107, 10.
8, (d) shows the operation of the drive motor 20 for driving the film folding mechanism, and (e) and (f'
) are periods A and B of (d) above, respectively.

It is a figure showing the details of C.

The CPU I O receives the weighing stability signal from the weighing label printer 15 and drives the drive motor 18 . This drive motor 1
8 is driven, the timing signal generator 19
A timing signal is generated from the CPU 10 and supplied to the CPU 10 via the mechanism control section 16. The timing signal generating section 19 includes a timing disk in which slits are provided at predetermined angles. The packaging machine of this embodiment is configured to complete one packaging cycle during one rotation of the timing disc, and detects the rotation angle of the timing disc,
Each part is controlled based on this rotation angle. That is, 5
The elevator starts to ascend at the @ timing, rises to 65 degrees, starts descending at 115 degrees, and stops descending at 175 degrees.

As the elevator rises, the objects to be packaged housed in the trays placed on the head are pushed up, and the films stretched under the left folding plates 107 and 108 are pushed up by the objects to be packaged. The object is made to protrude above the left folding plates 107 and 108.

The drive motor 20 for driving the film folding mechanism starts normal rotation at a timing of 60'' and stops at a timing of 140''. As a result, as shown in (C), the rear folding plate 10
5 and the left and right folding plates 107 and 108 start operating at a timing of 60'' and stop at a timing of 140°.

Then, at the timing of 280, the reverse rotation starts and the rotation reaches 340°.
It will stop at the timing of. That is, from the timing 60'' to 140°, the left and right folding plates 107 and 108 approach each other at the same time as the rear folding plate 105 is advanced.From the timing 260'' to 340'', the left and right folding plates 107 and 108 approach each other at the same time as the rear folding plate 105 is moved backward. 107 and 108 are separated from each other. At this time, the opening drive motor 20 is opened during the period C from 320° to 340° before stopping during the period from timing 2601 to 3409, that is, before the rear folding plate 105 completes retraction.
The power supplied to is pulsed as shown in (f'). The pulse width of this pulsed power is determined by the timer 12, and is turned on and off every 20 msec.

As described above, the pulsed power is supplied to the drive motor 20 for driving the film folding mechanism for a predetermined period (period C in FIG. 3) before stopping when the rear folding plate 105 retreats. The torque of the drive motor 20 can be adjusted by the duty ratio. In the above example, 20
Since it is a pulsed power that turns 0N-OFF every mS e e, the torque is approximately 1/2 of that when sending continuous power.
becomes.

FIG. 4 is a circuit diagram showing a specific example of a drive control circuit for the drive motor 20 for driving the film folding mechanism. In the figure, 10a is the I10 port of the CPU10, 16a is a control section for the film folding mechanism of the mechanism control section 16, and 21 is a single-phase AC power source. The control section 16a includes diodes D,...
D., solid state relays 5SRI, SSR, photocoupler hp, and amplifier Am are provided. Note that the terminal T of the drive motor 20. is common, terminal T is normal rotation, terminal T
ll is each terminal for reverse rotation, and terminal B is a terminal for the brake circuit of the motor.

In the drive control circuit with the above configuration, the solid state relays SSR and SSR* are connected to the terminal PMI of the I10 boat.
and terminal PM2 is 1. If it is "0", it will be OFF, and if it is "0", it will be ON. When the outputs of the terminals PMI and PM2 are pulsed r□ and set to "1", the power from the single-phase AC source 21 is converted into pulsed power by the solid state relays SSR and SSR, and is then applied to the drive motor 20. will be supplied.

When the timing of CPUI O reaches 60°, the terminal P
Set the output of MI to "0" and connect the solid state relay SS.
R, is turned on, and power is continuously supplied from the single-phase AC power supply 21 to the terminal T of the drive motor 20 until the timing reaches 140°.
, supply to. As a result, the drive motor 20 rotates forward,
As described above, the left and right folding plates 107 and 108 are brought closer to each other at the same time as the rear folding plate 105 is advanced. As a result, the rear end and left and right ends of the film are folded into the bottom of the tray. Next, when the timing reaches 260°, the CPU
0 sets the output of terminal PM2 to 10'', turns on the solid state relay SSR, and continuously supplies power from the single-phase AC power source 21 to the drive motor 2 until the timing reaches 320°.
0 terminal T. As a result, the drive motor 20
is reversed, and at the same time as the rear folding plate 105 is retreated as described above, the left and right folding plates 107 and 108 are moved in a direction away from each other. Then, at timing 320', when the output of terminal PM2 is pulsed and 'OJ + 'IJ is repeated every 20 msec, the power from single-phase AC power supply 21 is pulsed by solid state relay SSR. The electric power is supplied to the terminal T of the drive motor 20, and the drive motor 20 is driven with approximately half the torque.

FIGS. 5(a) and 5(b) are diagrams showing a processing flow for drive control of the drive motor 20 for the film folding mechanism. In FIG. 5(a), first, it is determined in step Sl) whether the timing has reached 60°, and if YES, step S2 is executed to drive the drive motor 20 in normal rotation with full torque. Next, it is determined whether the timing has reached 140° (step S3), and if YES, step S4 is executed to stop the drive motor 20.

Next, it is determined whether timing 260@ has come (step S5), and if YES, step S6 is executed to drive the drive motor 20 in reverse and with full torque. Next, it is determined whether the timing 320' has arrived (step S7), and if YES, step S8 is executed to drive the drive motor 2o in reverse and at half torque. Next, step S determines whether the timing has reached 340°.
9) If Yes, execute step S10 and stop the drive motor 20.

In the process of step S8, as shown in FIG. 5(b), it is determined whether the timer 12 (see FIG. 1) is ON or not (step S8-1), and if YES, step 58-2 is performed. Execute and connect terminal PM2 of I10 boat 10a.
If the answer is No, step 58-3 is executed and the terminal PM2 of the I10 boat 10a is set to "1". As described above, the timer 12 is set to repeat ON and OFF every 20 ms e c, so by the process of step S8, the timer 12 is turned on and off every 20 ms e c from the single-phase AC power supply 21 via the solid state relay SSR. A pulse-like electric power that repeats ON and OFF is applied to the drive motor 2.
0 terminal T,. As a result, the drive motor 2o
The torque is approximately half of the total torque.

In the above embodiment, the timing to stop the drive motor 20 is obtained from a timing signal, but a sensor is provided to detect the position of the rear folding plate 105, and the drive motor 20 is stopped based on the detection signal from this sensor. Of course, it may be configured so that the

When using a solid-state relay to supply pulsed power to the drive motor 20, there are two types, a so-called zero-cross method and a non-zero-cross method, depending on whether or not the solid-state relay has a built-in zero-cross circuit. In the zero-cross method, when the input signal is turned on, the built-in zero-cross circuit triggers the AC load near zero voltage, and the output turns on.
It is something to do. On the other hand, since the non-zero-crossing method does not have a built-in zero-crossing circuit, the output operates in response to the input signal. However, the latter non-zero crossing method has the problem that noise is likely to occur when the input signal is turned on, and this noise affects other circuits, so that other noise countermeasures must be taken. Therefore, in this embodiment, the former zero-crossing method is adopted.

In the zero cross method, when the input signal Is shown in Figure 6 (a) is input to the solid state relay, the AC load voltage in (b) is triggered near zero voltage, and the output is (C).
Turn on as shown. By the way, since the commercial AC source is 50 cycles or 20 cycles, for example, in the case of 50 cycles, the cycle is 2 as shown in Section 11(d).
0m5ec, and the pulse width of the input signal Is is as shown in the figure (e
), if the input signal Is is less than 10 msec, the input signal Is may fall between the zero-crossing points of the AC load voltage, and the solid state relay may not be able to turn on. Therefore, it is necessary to make the pulse width of the input signal at least 1/2 or more of the cycle of the AC power supply (10 m5ec or more in the case of 50 cycles) so that a zero-crossing point always exists within the pulse width of the input signal.

In addition, in order to rotate the motor smoothly, for example, as shown in Figure 7 (c), one cycle (or several cycles) of the AC voltage (Figure 7 (b)) must be set at intervals of one cycle (or several cycles). It is preferable that the water be supplied regularly. Therefore, in this embodiment, the input signal of the solid state relay (FIG. 7(a)) is a pulse signal with a pulse width of 20 m5ec and a duty of 50%. In addition, since this embodiment was intended to be implemented without changing the hardware configuration of the conventional packaging apparatus, the above pulse signal is obtained from the output of the timer 12 connected to the CPU10.

Therefore, the input signal of the solid state relay is asynchronous with the AC frequency. In the case of a zero-cross type solid state relay, if the input signal is turned ON or 0FFt within a certain period of time immediately before the AC voltage crosses zero, the operation becomes unstable. When the input signal is asynchronous with the AC frequency, the input signal may turn on or off during the unstable operation period, as shown in FIGS. 8(a) and 8(b). In this case, due to causes such as fluctuations (minor fluctuations) in the AC frequency, the regularity of the pulsed voltage supplied to the motor is disrupted, as shown in Figure 3 (C), and the torque and rotational speed fluctuate. It turns out.

If the occurrence of such a situation is undesirable, the input signal may be synchronized with the AC frequency. FIG. 9 is a block circuit showing an example of a circuit that generates a signal synchronized with an AC frequency. The synchronization signal generation circuit 30 includes a binary counter 3
1, a comparator 32, a half-wave rectifier circuit 33, and a transformer 34. The AC voltage ev is stepped down to the AC voltage e' (FIG. 10(a)) by the transformer 34, and after being half-wave rectified by the half-wave rectifier circuit 33 (the flow diameter voltage e''), it is supplied to the comparator 32. The comparator 32 turns on its output only when the supplied signal is higher than the reference voltage E. Therefore, the output of the comparator 32 is the pulse signal SP (10th
(C)) is generated and supplied to the binary counter 31. The binary counter 31 divides the input pulse signal by 1/2.
A signal SH (FIG. 10(d)) whose frequency is divided into two is generated. This signal SH has a pulse width of 20 msec, a duty of 50%, and is synchronized with the AC frequency. This signal is supplied to CPU10 via the I10 port.

Therefore, by programming the CPUI O to use the signal SH instead of the output of the timer 12 to generate the input signal pulse of the solid state relay, the input signal and the AC frequency can be synchronized. The input signal can be turned on and off in a stable state at all times.

In the above embodiment, the drive motor 20 was controlled so that its torque was approximately 1/2 of the total torque for a predetermined period before stopping when the folding plate was retreated after the film folding mechanism. The magnitude of the torque is not limited to this, and may be larger or smaller, as long as it is suitable for preventing damage to each part of the mounting plate and cam mechanism, and reducing noise. The change in torque is not limited to one stage,
It goes without saying that it may be configured to switch to multiple stages.

Further, in the above embodiment, the film folding mechanism is provided with mounting plates 101 and 102 that face each other and are movable left and right, and a left and right folding plate 107 attached to the mounting plates 101 and 102.
, 108 and cam grooves 103, 1 provided on this mounting plate.
04, and a rear folding plate 105 having cam rollers 131 and 132 that move back and forth in a direction perpendicular to the moving direction of the mounting plates 101 and 102 and move along cam grooves 103 and 104.
By moving the rear folding plate 105 back and forth with the driving force of the drive motor 20, the cam groove 103.1
04 and cam rollers 131, 132, etc., the left and right folding plates 107 and 108 move toward and away from each other. However, the film folding mechanism of a packaging machine using the drive control device of the present invention is not limited to the above-mentioned configuration, and the point is that the left and right folding plates are movable in directions facing each other, and the left and right folding plates are substantially movable in the direction of movement of the left and right folding plates. If the film folding mechanism has a rear folding plate that moves in a right angle direction, and the rear folding plate and the left and right folding plates are configured to interlock with each other directly or indirectly via a cam mechanism, the specific configuration thereof is can be anything.

Although the above embodiment was a case of control using a software method, it is clear that the desired effect can be obtained by performing similar control using a hardware method.
It is not limited to software control only.

In addition, although an AC single-phase motor was used in this embodiment, the torque of the drive motor is switched from high to low for a predetermined period before stopping when the drive motor reverses, and if it is a motor, there are limitations on the type of motor. There is no.

〔Effect of the invention〕

As explained above, according to the present invention, the following excellent effects can be obtained.

■A motor drive control means is provided to control the torque of the drive motor to be switched from high to low for a predetermined period before stopping when the drive motor is reversed, so when the rear folding plate is completely retracted, the cam mechanism and the left and right folding plate mounting parts The instantaneous impact is weakened, and as a result, it is possible to prevent these damages without requiring a special structure for the film folding mechanism of the packaging machine, and it is also possible to reduce the noise generated at the time.

■In addition, the structure of the cam mechanism and the left and right folding plate mounting parts can be simplified, reducing costs and simplifying assembly work.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the system configuration of the drive control unit of the film folding mechanism of the packaging machine and the control units of various parts related to this, Fig. 2 is a plan view of the film folding mechanism of the packaging machine, and Fig. 3
The figure is a mechanical chart for explaining the operation of the film folding mechanism, FIG. 4 is a circuit diagram showing a specific example of a drive control circuit for a drive motor for driving the film folding mechanism, and FIG.
a). (b) is a diagram showing the process flow of drive control of the drive motor for the film folding mechanism, FIG. 6 is a diagram for explaining the operation of the solid state relay, and FIGS. 7(a) and (b)
, (c) is a waveform diagram for explaining unstable operation of the drive motor, and FIG. 8(a). (b) and (c) are waveform diagrams to explain the unstable operation of the drive motor, Figure 9 is a block circuit diagram showing an example of a circuit that generates a signal synchronized with the AC frequency, and Figure 10 is its operation. FIG. In the figure, 10...CPU, 11...ROM, 12
...Timer 13...RAM, 14...
Interface circuit, 15...Weighing label printer, 16... Mechanism control unit, 17... Switch,
18... Drive motor, 19... Timing signal generator, 20... Drive motor, 101, 102...
・・Mounting plate, 103, 104・・Cam groove, 105・
...Rear folding plate, 107,108...Left folding plate, 109.110...Shaft, 111,112...
Coil spring, 113, 114, 115, 116...
Sliding member, 117, 118, 119, 120... rod, 131, 132... cam roller.

Claims (1)

[Scope of Claims] (1) It has left and right folding plates that are movable in directions facing each other and a rear folding plate that moves in a direction substantially perpendicular to the direction of movement of the left and right folding plates, and the rear folding plate and the In a packaging machine film folding mechanism, the left and right folding plates are provided with a film folding mechanism configured to interlock with each other directly or indirectly via a cam mechanism, and a drive motor for driving the film folding mechanism. When the rear folding plate advances due to forward rotation, the left and right folding plates approach each other, and when the drive motor reverses, the rear folding plate moves backward, and at the same time, the left and right folding plates move away from each other. 1. A drive control device for a film folding mechanism of a packaging machine, comprising a motor drive control means for controlling the torque of the drive motor from high to low for a predetermined period before stopping when the drive motor is reversed. (2) The motor drive control means includes a torque control means for supplying pulsed power to the drive motor for a predetermined period before the stop, and changing the motor torque according to the pulsed duty ratio. A drive control device for a packaging machine film folding mechanism according to claim (1). (3) Drive control of a packaging machine film folding mechanism according to claim (2), wherein the drive motor is an AC motor, and the pulse width of the pulsed electric power is at least larger than 1/2 period of the AC power supply. Device. (4) The torque control means of the motor drive control means is constituted by a solid state relay that is turned on and off by a signal from a computer.
2) or (3) a drive control device for a packaging machine film folding mechanism;